The present study was undertaken to the estimate inbreeding coefficient in Corriedale sheep under different agro-climatic conditions of Jammu and Kashmir. The pedigree file of 6,874 records of Corriedale sheep, maintained at Mountain Research Centre for Sheep & Goat (MRCSG), & , SKUAST-K Shuhama, for a period of 49 years (1969- 2017) was used to calculate inbreeding coefficients. The individual inbreeding coefficients were measured by Wright’s formula and was computed from the pedigree containing 6,874 animals using CFC software package and expressed as percentage. Average inbreeding coefficient (F) of the lambs generally increased over the periods. The mean inbreeding coefficient (F), proportion of population inbred (per cent), for Corriedale sheep were and respectively. During initial periods, inbreeding coefficient was and it increased upto during the last period. During the initial period (P1, (1969-1975) about were inbred and gradually increased upto during the last period (P7, (2011- 2017). The coefficient of inbreeding ranged from 0 to in inbred lambs. It was concluded that by avoiding the mating between related individuals and by the introduction of breeding rams, unnecessary and undesirable increase of inbreeding in the flock can be minimized.
